diff --git a/src/main/dig/sequential/conway/cellLUT.dig b/src/main/dig/sequential/conway/cellLUT.dig
index 26869a921..c5d96885b 100644
--- a/src/main/dig/sequential/conway/cellLUT.dig
+++ b/src/main/dig/sequential/conway/cellLUT.dig
@@ -18,7 +18,7 @@ sehen Sie sich die Datei discrete.dig an.}}</string>
       <elementAttributes>
         <entry>
           <string>Data</string>
-          <data size="2048">0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,1,0,1,1,1,1,1,0,0,0,0,0,1,0,1,0,
+          <data>0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,1,0,1,1,1,1,1,0,0,0,0,0,1,0,1,0,
 1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1,0,1,0,1,0,1,1,1,1,1,0,1,
 0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,0,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,1,0,1,0,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,0,1,
@@ -117,16 +117,6 @@ Val genutzt um die Zelle zu initialisieren.}}</string>
       </elementAttributes>
       <pos x="420" y="380"/>
     </visualElement>
-    <visualElement>
-      <elementName>In</elementName>
-      <elementAttributes>
-        <entry>
-          <string>Label</string>
-          <string>C</string>
-        </entry>
-      </elementAttributes>
-      <pos x="580" y="300"/>
-    </visualElement>
     <visualElement>
       <elementName>Out</elementName>
       <elementAttributes>
@@ -142,6 +132,16 @@ Val genutzt um die Zelle zu initialisieren.}}</string>
       </elementAttributes>
       <pos x="700" y="280"/>
     </visualElement>
+    <visualElement>
+      <elementName>Clock</elementName>
+      <elementAttributes>
+        <entry>
+          <string>Label</string>
+          <string>C</string>
+        </entry>
+      </elementAttributes>
+      <pos x="580" y="300"/>
+    </visualElement>
     <visualElement>
       <elementName>In</elementName>
       <elementAttributes>
diff --git a/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java b/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
index b6986559f..49df34893 100644
--- a/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
+++ b/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
@@ -205,15 +205,25 @@ public class CircuitBuilder implements BuilderInterface<CircuitBuilder> {
     }
 
     private Fragment createFragment(Expression expression) throws BuilderException {
-        boolean lutNeeded = true;
-        if (expression instanceof Variable)
-            lutNeeded = false;
-        else if (expression instanceof Not && ((Not) expression).getExpression() instanceof Variable)
-            lutNeeded = false;
+        if (useLUT) {
+            if (expression instanceof Variable)
+                return createBasicFragment(expression);
+
+            if (expression instanceof Not && ((Not) expression).getExpression() instanceof Variable)
+                return createBasicFragment(expression);
+
+            if (expression instanceof Operation) {
+                boolean allVars = true;
+                for (Expression ex : ((Operation) expression).getExpressions()) {
+                    if (!(ex instanceof Variable || (ex instanceof Not && ((Not) ex).getExpression() instanceof Variable)))
+                        allVars = false;
+                }
+                if (allVars)
+                    return createBasicFragment(expression);
+            }
 
-        if (useLUT && lutNeeded)
             return createLutFragment(expression);
-        else
+        } else
             return createBasicFragment(expression);
     }